Shiva Dhar

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Plants and most of the microorganisms in the rhizosphere have symbiotic relationships. While rhizodeposits (root exudates having lysates, mucilages) provide the food and influence the structure and number of microorganisms in the rhizosphere, the latter benefit the plants through secretion of a number of growth promoting hormones, organic acids and(More)
The observation of a high-mobility two-dimensional electron gas between two insulating complex oxides, especially LaAlO₃/SrTiO₃, has enhanced the potential of oxides for electronics. The occurrence of this conductivity is believed to be driven by polarization discontinuity, leading to an electronic reconstruction. In this scenario, the crystal orientation(More)
The recent discovery of ferromagnetism above room temperature in low-temperature-processed MnO(2)-ZnO has generated significant interest. Using suitably designed bulk and thin-film studies, we demonstrate that the ferromagnetism in this system originates in a metastable phase rather than by carrier-induced interaction between separated Mn atoms in ZnO. The(More)
We report the observation of spatially separated Kondo scattering and ferromagnetism in anatase Ta0.06Ti0.94O2 thin films as a function of thickness (10-200 nm). The Kondo behavior observed in thicker films is suppressed on decreasing thickness and vanishes below ~25 nm. In 200 nm film, transport data could be fitted to a renormalization group theory for(More)
Deficiency of wheat grain iron (Fe) and zinc (Zn) is common nutritional problem in the developing countries and thus increasing their concentrations is a major challenge. Field experiments were conducted to investigate the effect of different levels of fertilizer nitrogen, phosphorus, potassium (100–200 % NPK) and foliar Fe application (3 % FeSO4.7H2O at(More)
There are many electronic and magnetic properties exhibited by complex oxides. Electronic phase separation (EPS) is one of those, the presence of which can be linked to exotic behaviours, such as colossal magnetoresistance, metal-insulator transition and high-temperature superconductivity. A variety of new and unusual electronic phases at the interfaces(More)
(Publications with a * at the end are either published from IISER Pune or have IISER Pune affiliations mentioned in the paper) Inhibition of SIRT1 by a small molecule induces apoptosis in breast cancer cells. shock protein 90 as a drug target against protozoan infections: Biochemical characterization of Hsp90 from Plasmodium falciparum, Trypanosoma evansi(More)
An analytical model for the low-field bulk electron mobility tensor in strained germanium is presented. The model includes the effects of strain-induced splitting of the conduction band valleys in germanium and the corresponding inter-valley scattering reduction as well as temperature and doping dependence. Bulk mobility values larger than 2.5 times the(More)
We have performed a detailed analysis of the electron transport at high electric field in strained Si for different field directions and stress/strain conditions using Full-band Monte Carlo simulations. A phenomeno-logical model describing the velocity-field relationship for electrons in biaxially or uniaxially strained Si has been developed. The model is(More)
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